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Issue #10: Remove too old pages from cache

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This commit is contained in:
Jakub Melka
2022-02-05 18:18:21 +01:00
parent 49cab7937a
commit 8bf2913ded
5 changed files with 106 additions and 1 deletions
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38
Pdf4QtLib/sources/pdfdrawspacecontroller.cpp
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@ -26,6 +26,7 @@
#include "pdfannotation.h"
#include "pdfdbgheap.h"
#include <QTimer>
#include <QPainter>
#include <QFontMetrics>
@ -464,6 +465,7 @@ PDFDrawWidgetProxy::PDFDrawWidgetProxy(QObject* parent) :
m_textLayoutCompiler(new PDFAsynchronousTextLayoutCompiler(this)),
m_rasterizer(new PDFRasterizer(this)),
m_progress(nullptr),
m_cacheClearTimer(new QTimer(this)),
m_useOpenGL(false)
{
m_controller = new PDFDrawSpaceController(this);
@ -473,6 +475,7 @@ PDFDrawWidgetProxy::PDFDrawWidgetProxy(QObject* parent) :
connect(m_compiler, &PDFAsynchronousPageCompiler::renderingError, this, &PDFDrawWidgetProxy::renderingError);
connect(m_compiler, &PDFAsynchronousPageCompiler::pageImageChanged, this, &PDFDrawWidgetProxy::pageImageChanged);
connect(m_textLayoutCompiler, &PDFAsynchronousTextLayoutCompiler::textLayoutChanged, this, &PDFDrawWidgetProxy::onTextLayoutChanged);
connect(m_cacheClearTimer, &QTimer::timeout, this, &PDFDrawWidgetProxy::performPageCacheClear);
}
PDFDrawWidgetProxy::~PDFDrawWidgetProxy()
@ -484,6 +487,7 @@ void PDFDrawWidgetProxy::setDocument(const PDFModifiedDocument& document)
{
if (getDocument() != document)
{
m_cacheClearTimer->stop();
m_compiler->stop(document.hasReset());
m_textLayoutCompiler->stop(document.hasReset());
m_controller->setDocument(document);
@ -495,6 +499,11 @@ void PDFDrawWidgetProxy::setDocument(const PDFModifiedDocument& document)
m_compiler->start();
m_textLayoutCompiler->start();
if (document)
{
m_cacheClearTimer->start(CACHE_CLEAR_TIMEOUT);
}
}
}
@ -951,6 +960,29 @@ std::vector<PDFInteger> PDFDrawWidgetProxy::getPagesIntersectingRect(QRect rect)
return pages;
}
std::vector<PDFInteger> PDFDrawWidgetProxy::getActivePages() const
{
std::vector<PDFInteger> activePages = getPagesIntersectingRect(m_widget->rect());
// Consider page prefetching - at least two pages after last current
// pages are treated as active.
if (!activePages.empty())
{
if (const PDFDocument* document = getDocument())
{
const PDFInteger pageIndex = activePages.back();
const PDFInteger pageCount = document->getCatalog()->getPageCount();
const PDFInteger pageEnd = qMin(pageCount, pageIndex + 3);
for (PDFInteger i = pageIndex + 1; i < pageEnd; ++i)
{
activePages.push_back(i);
}
}
}
return activePages;
}
PDFInteger PDFDrawWidgetProxy::getPageUnderPoint(QPoint point, QPointF* pagePoint) const
{
// Iterate trough pages, place them and test, if they intersects with rectangle
@ -1259,6 +1291,12 @@ QRectF PDFDrawWidgetProxy::fromDeviceSpace(const QRectF& rect) const
rect.height() * m_deviceSpaceUnitToPixel);
}
void PDFDrawWidgetProxy::performPageCacheClear()
{
std::vector<PDFInteger> activePage = getActivePages();
m_compiler->smartClearCache(CACHE_PAGE_EXPIRATION_TIMEOUT, activePage);
}
void PDFDrawWidgetProxy::onTextLayoutChanged()
{
emit repaintNeeded();